// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018, Red Hat, Inc. * * Tests for SMM. */ #define _GNU_SOURCE /* for program_invocation_short_name */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <string.h> #include <sys/ioctl.h> #include "test_util.h" #include "kvm_util.h" #include "vmx.h" #define VCPU_ID 1 #define PAGE_SIZE 4096 #define SMRAM_SIZE 65536 #define SMRAM_MEMSLOT ((1 << 16) | 1) #define SMRAM_PAGES (SMRAM_SIZE / PAGE_SIZE) #define SMRAM_GPA 0x1000000 #define SMRAM_STAGE 0xfe #define STR(x) #x #define XSTR(s) STR(s) #define SYNC_PORT 0xe #define DONE 0xff /* * This is compiled as normal 64-bit code, however, SMI handler is executed * in real-address mode. To stay simple we're limiting ourselves to a mode * independent subset of asm here. * SMI handler always report back fixed stage SMRAM_STAGE. */ uint8_t smi_handler[] = { 0xb0, SMRAM_STAGE, /* mov $SMRAM_STAGE, %al */ 0xe4, SYNC_PORT, /* in $SYNC_PORT, %al */ 0x0f, 0xaa, /* rsm */ }; void sync_with_host(uint64_t phase) { asm volatile("in $" XSTR(SYNC_PORT)", %%al \n" : : "a" (phase)); } void self_smi(void) { wrmsr(APIC_BASE_MSR + (APIC_ICR >> 4), APIC_DEST_SELF | APIC_INT_ASSERT | APIC_DM_SMI); } void guest_code(struct vmx_pages *vmx_pages) { uint64_t apicbase = rdmsr(MSR_IA32_APICBASE); sync_with_host(1); wrmsr(MSR_IA32_APICBASE, apicbase | X2APIC_ENABLE); sync_with_host(2); self_smi(); sync_with_host(4); if (vmx_pages) { GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); sync_with_host(5); self_smi(); sync_with_host(7); } sync_with_host(DONE); } int main(int argc, char *argv[]) { vm_vaddr_t vmx_pages_gva = 0; struct kvm_regs regs; struct kvm_vm *vm; struct kvm_run *run; struct kvm_x86_state *state; int stage, stage_reported; /* Create VM */ vm = vm_create_default(VCPU_ID, 0, guest_code); vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); run = vcpu_state(vm, VCPU_ID); vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, SMRAM_GPA, SMRAM_MEMSLOT, SMRAM_PAGES, 0); TEST_ASSERT(vm_phy_pages_alloc(vm, SMRAM_PAGES, SMRAM_GPA, SMRAM_MEMSLOT) == SMRAM_GPA, "could not allocate guest physical addresses?"); memset(addr_gpa2hva(vm, SMRAM_GPA), 0x0, SMRAM_SIZE); memcpy(addr_gpa2hva(vm, SMRAM_GPA) + 0x8000, smi_handler, sizeof(smi_handler)); vcpu_set_msr(vm, VCPU_ID, MSR_IA32_SMBASE, SMRAM_GPA); if (kvm_check_cap(KVM_CAP_NESTED_STATE)) { vcpu_alloc_vmx(vm, &vmx_pages_gva); vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva); } else { pr_info("will skip SMM test with VMX enabled\n"); vcpu_args_set(vm, VCPU_ID, 1, 0); } for (stage = 1;; stage++) { _vcpu_run(vm, VCPU_ID); TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, "Stage %d: unexpected exit reason: %u (%s),\n", stage, run->exit_reason, exit_reason_str(run->exit_reason)); memset(®s, 0, sizeof(regs)); vcpu_regs_get(vm, VCPU_ID, ®s); stage_reported = regs.rax & 0xff; if (stage_reported == DONE) goto done; TEST_ASSERT(stage_reported == stage || stage_reported == SMRAM_STAGE, "Unexpected stage: #%x, got %x", stage, stage_reported); state = vcpu_save_state(vm, VCPU_ID); kvm_vm_release(vm); kvm_vm_restart(vm, O_RDWR); vm_vcpu_add(vm, VCPU_ID); vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); vcpu_load_state(vm, VCPU_ID, state); run = vcpu_state(vm, VCPU_ID); free(state); } done: kvm_vm_free(vm); }